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Sony ENG / EFP Shoulder Mounts
Sony PDW-F800, PDW-700, PDW-850, PXW-X500 (XDCAM HD) and PMW-400, PMW-320 (XDCAM EX).


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Old January 20th, 2010, 01:39 PM   #1
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Choppy result - for some time - on Bluray

I experienced something very awkward when burning edited movies from my XDCAM-HD (PDW-F350) to Bluray disk: whenever there's a panning or other motion, the first few seconds the image stutters, but after that everything moves smoothly. So there a a few seconds of choppy video, followed by perfect footage.

How is this possible? Is it a Bluray encoding artefact? (Shot in HD, 25p, edited in FCP, exported to QT in ProRes 422 and encoded that QT-movie to Bluray).
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Old January 20th, 2010, 05:37 PM   #2
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what output setting do you have in the Blu-ray player setup menu?

mine can be set to 1080p or 1080i or 720p
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Old January 21st, 2010, 02:41 AM   #3
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Bitrate may be too high?

Just a thought but if your encoding for the bluray was using too high a bitrate that might have this effect - you didn't say what SW you are using to do the encoding?

FCP7?
Something else?

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Old January 21st, 2010, 08:57 AM   #4
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Bluray was burnt with 1080, movie was inported in Toast bluray burner in Quicktime (ProRes422). Editing was done in FCP 6 - starting from original clips in XDCAM-HD, 25 p. The Quicktime movie does not suffer from this effect, only the Bluray result.
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Old January 21st, 2010, 09:42 PM   #5
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did you output mpeg or H264 for the blu-ray

what max bitrate did you use for video and audio

when I use mpeg, I usually set fixed bitrate to 24000 (max at 35000 if using variable) for video and 384 for ac3 audio
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Old January 22nd, 2010, 02:24 AM   #6
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Anton, in Toast 10, there's very little I can choose as far as bitrate and burning speed are concerned. The 'burning speed' box is not even lighted up, so I cannot choose any of this. I'm using XDCAM 25 p variable bitrate to make the Quicktime movie, is that any help?
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Old January 22nd, 2010, 03:32 AM   #7
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but what are you putting on the blu-ray, it can only be mpeg or h264 or some other vc1 format that nobody uses
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Old January 22nd, 2010, 04:19 AM   #8
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MPEG, I suppose, there's no choice as far as I can see. Even in the 'recorder settings' there's no menu that offers format alternatives.
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Old January 22nd, 2010, 06:53 AM   #9
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sorry, but after doing lots of Blu-ray, I can assure you that there is no room for "I suppose"

a cheap encoding and authoring tool can be found at TMPGEnc - We Make Digital Video Easy!
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Old January 22nd, 2010, 07:01 AM   #10
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I just bought Roxio's Toast 10 + HD-Plug in for 250,- euros. Will the software you mention give me better quality and more control of the burning process on a Mac? Authoring is not so important for me, top quality image is.
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Old January 22nd, 2010, 09:45 PM   #11
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ouch, don't think there is a Mac version
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Old January 23rd, 2010, 04:02 AM   #12
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Dont know if its relevant but in all my IPTV tests I have had a lot of problems using long gop material for transcoding to web and DVD, dont know about blu ray but for a lot of my tests I had to transcode to flash to stabilise the stream.

Now I am on panasonic P2 with intra frame codecs it never happens anymore.
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Old January 23rd, 2010, 04:07 AM   #13
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Anton, I talked to somenone yesterday who has some experience with Bluray, and he told me that this is a typical bluray problem. The very first frames of any new movement (pan, tilt, zoom) are choppy, then the movement smoothens. That's exactly what I'm experiencing. Have you experienced this too? I cannot imagine all bluray-users accepting this as 'normal'.

Any other suggestions?

Gary, Thanks for the info. The strange thing is that 90% of the movement is OK and smooth. It only stutters just in the very beginning. I know the problem you describe, but that represents itself al along the movie when there's a pan or a tilt, not just for a few seconds at the start of every fresh movement. Most of the footage looks fantastic, only when panning, zooming or tilting there is this strange 'stutter' that stabilizes immediately afterwards.
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Old January 23rd, 2010, 04:29 AM   #14
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I saw that stutter several times when I was on long gop and as you say its at the start, it was almost like some form of encoding buffer was trying to catch up and re-sync the frames.

Making material progressive seemed to improve it but I had lots of hours spent with problems uploading material that had been re-compressed for delivery.

As said I dont have those problems now so whether the 35mbs long gop codecs dont like re-compressing or not I dont know.
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Old January 23rd, 2010, 04:45 AM   #15
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That indeed sounds like the same problem, Gary. I'm always using progressive mode, so it's not awful, just a little disturbing (and distracting). Did you eventually find a solution to get rid of it?

I also posted this on the Bluray authoring forum a week ago, but all I got was only 48 readers, no repliers...
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